XYML'IIALIXAE : I'CJLYCiOXIA JXTKKIlOCATIONiS. 



323 



a more or less irregular and considerable curve, openiuji iuAvards, to the vein closing 

 the cell; here it stops and starts again in the median area from the ])ase of the straight 

 portion of the upper median nervule, passing in a straight line to the middle of the 

 inedio-submedian interspace opposite the middle of the lower median nervule, and is 

 then bent and directed toward the deepest part of the excision of the inner border; 

 its inner limit is more regular and like the exterior is edged above the subcostal with 

 a dark ciiniamoneous line; the cell is bounded apicallj^ by a rather slender arcuate 

 stripe of nacreous silver, its upper extremity just failing to reach the subcostal ner- 

 vule and generally slightly i)roduced toward the outer border, previous to which it is' 

 sometimes slightly strangled ; beyond this, next the median nervule is a silvery dot, 

 not so far from the inferior extremity of the silvery stripe as the length of the stripe; 

 the base of the preeostal nervure has also a white or silvery dot. In the apical half 

 of the Aving an arcuate series of dots like those in the fore wing, that in the lower 

 me lian intersi)ace in the middle of the outer two-thirds of the interspace; in the ^ 

 the dots are in the middle of a faint, rather broad, douljle arcuate, darker band, one in 

 the upper and one in the lower half of the Aving, parallel to the outer border; and 

 midway between the dots and the outer border is another series, like those of the 

 fore wings, of pale dots; the outer border quite resembles tliat of the fore wings 

 in both sexes, except in wanting the bloom at the upper outer angle of the wing; fringe 

 much as in the fore wings. 



.Vb(h)men above black, heavily covered with fulvous hairs and scales ; beneath with 

 intermingled hoary and fulvous scales, giving it a grayish appearance. Alxlominal 

 appendages (33 : 19, 20) : upper organ; hook slenderer at the base than in the other 

 species, tapering throughout, as long as the body, very slightly arched, bluntly pointed. 

 Clasps nearly twice as broad as long, slightly longer below than above, quadrate Avith 

 rounded angles, the upper hinder angle produced to a small, rounded, incurved, triangu* 

 lar lobe about as long as broad ; upper border producing at base a long and slender 

 process longer than the clasp, on the basal half one-flfth as broad as the Avhole length, 

 equal, curved strongly inwai'd and directed a little backward, compressed, beyond 

 twisted so as to become depressed, tapering regularly to a blunt point, neaiiy hori- 

 zontal and directed backward and considerably inward ; interior finger long and 

 slender, tapering only at tip. a little curved and scarcely surpassing the upper border 

 of the clasp. 



POLYGONIA INTERROGATIOXIS FABEICII. 



POLYGONIA INTERROGATIOXIS UMBROSA. 



Described from 8 3 13?. 



Dimorphic forms. The following peculiarities distinguish the form umbrosa from 

 fabricii. the latter of which formed the basis of the foregoing description: First, as 

 regards the form, the upper portion of the outer border of the/o?'e icuigrs is straight, re- 

 ceding at scarcely less than a right angle ; dentation at tip of the lower median nervule 

 slight, augulated; loAver angle produced but little downward, ratlier broadly rounded; 



